Want to quiet some drone - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 8 (permalink) Old 09-28-2011, 12:29 AM Thread Starter
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Want to quiet some drone

My current setup (THIS IS ON A GXP):

Kooks mids, HF Cats back thru resonators and an x-pipe....then STRAIGHT PIPES from axle back.

It's amazingly quiet except at startup and WOT. The problem ? Highway drone. I've been bolting the stock GXP axle-backs on for road trips, but they are just too quiet otherwise. So I'm thinking that Solo Machs (with J-pipes ?) would allow decent sound, but dial back the drone. Then I wouldn't be swapping exhausts before/after each trip. And it would look better than straight pipes I'm sure.

Your thoughts ? I assume the Machs bolt up on a GXP with properly matched tube sizes. Or are the GT and GXP axle-back connections different sizes ?

White-hot G8 GXP...stock stall, NicD tune, Kooks mids, TVS2300
--------------------------------------
New crate motor Feb 2016
Mar 2017: 12.0 @ 119.5 at Tucson Dragway
Jun 2017: Comp Cam, OEM cats removed
Nov 2017: 11.9 @ 122 at Tucson Dragway, DA = 4600
Jan 2018: Re-tuned for cat removal. Pulley down to 2.8
Jan 2018: 11.7 @ 122.5 at WHP, DA = 1500 bad traction
Dec 2018: 11.7 @ 121 at Tucson Dragway, DA 4000
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post #2 of 8 (permalink) Old 09-28-2011, 10:34 AM
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Quote:
Originally Posted by jbak View Post
My current setup (THIS IS ON A GXP):

Kooks mids, HF Cats back thru resonators and an x-pipe....then STRAIGHT PIPES from axle back.

It's amazingly quiet except at startup and WOT. The problem ? Highway drone. I've been bolting the stock GXP axle-backs on for road trips, but they are just too quiet otherwise. So I'm thinking that Solo Machs (with J-pipes ?) would allow decent sound, but dial back the drone. Then I wouldn't be swapping exhausts before/after each trip. And it would look better than straight pipes I'm sure.

Your thoughts ? I assume the Machs bolt up on a GXP with properly matched tube sizes. Or are the GT and GXP axle-back connections different sizes ?
You could put J-pipes on your existing pipes.

2009 G8 GXP, #715 0f 1829 (#18 of 23 as optioned), MSM, 6M, Sunroof, Onyx/Red

2009 G8 GXP, #807 of 1829 (#37 of 68 as optioned), MSM, 6A, Sunroof, Onyx

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post #3 of 8 (permalink) Old 09-28-2011, 11:58 AM Thread Starter
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Quote:
Originally Posted by GXPaycheck View Post
You could put J-pipes on your existing pipes.

Interesting... guess I'll have to research j-pipes a bit more. I'd still be left with ugly tips though.

White-hot G8 GXP...stock stall, NicD tune, Kooks mids, TVS2300
--------------------------------------
New crate motor Feb 2016
Mar 2017: 12.0 @ 119.5 at Tucson Dragway
Jun 2017: Comp Cam, OEM cats removed
Nov 2017: 11.9 @ 122 at Tucson Dragway, DA = 4600
Jan 2018: Re-tuned for cat removal. Pulley down to 2.8
Jan 2018: 11.7 @ 122.5 at WHP, DA = 1500 bad traction
Dec 2018: 11.7 @ 121 at Tucson Dragway, DA 4000
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post #4 of 8 (permalink) Old 09-28-2011, 12:10 PM
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Adding a Magnaflow 12468 will cancel most drone out. Or the 3" version, 12469, towards the rear of the vehicle, or replace the xpipe.



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post #5 of 8 (permalink) Old 09-28-2011, 12:14 PM
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SOLO Sells axle backs, check here. They bolt up right where your other axlebacks do, so it would be a 10 minute swap job. The J-pipes would work perfectly to combat your 1800-2200rpm highway 6th gear drone, trust me, I know!!

Otherwise, you could replace your catback with a solo mach, as you hinted at, and their internal muffler design is an X-pipe so you wouldn't be changing the overall sound much, other than improving it. Here's a link to their catbacks, the official name is "Mach unbalanced" (not shorty, that's a bit louder at all speeds) .

Hope this helps... I know exactly what you're going through (alebit around Fall/Winter 2009 in my car) with the drone issue. The SOLO J-pipes that I co-developed with them are the real deal and work very well, especially so on your GXP. Not only that, but they're adjustable, in case your drone frequency is slightly different than what most G8's have.

--zepcom


2009.1 ZEPCOM MGM G8 GT
Kooks LT's, SOLO HFC & Mach Unbalanced with J-pipes, SLP Tips.
Livernois tune, VCM, FE3's, full Holden blue gauges conversion, iphone on display. Daily Driver FTW
The ZEPCOM G8 was SOLO's test mule
www.youtube.com/zepcom

Bought 3/30/2009, retired 7/18/2017 at 136k miles, still strong. Been a great ride, she will be missed!
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post #6 of 8 (permalink) Old 09-28-2011, 12:52 PM Thread Starter
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Axle-backs are definitely what I want, so I can just bolt-on.

So the pipe/flange sizes will match okay ?

White-hot G8 GXP...stock stall, NicD tune, Kooks mids, TVS2300
--------------------------------------
New crate motor Feb 2016
Mar 2017: 12.0 @ 119.5 at Tucson Dragway
Jun 2017: Comp Cam, OEM cats removed
Nov 2017: 11.9 @ 122 at Tucson Dragway, DA = 4600
Jan 2018: Re-tuned for cat removal. Pulley down to 2.8
Jan 2018: 11.7 @ 122.5 at WHP, DA = 1500 bad traction
Dec 2018: 11.7 @ 121 at Tucson Dragway, DA 4000
jbak is offline  
post #7 of 8 (permalink) Old 09-28-2011, 01:09 PM
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Quote:
Originally Posted by jbak View Post
Axle-backs are definitely what I want, so I can just bolt-on.

So the pipe/flange sizes will match okay ?

Axlebacks are just that. Mate perfectly to the equivilant to stock axleback location. If your custom-built catback-to-axleback area matches with the stock config... (seems so, since you say you put the stock cans on there from time to time) .... then the SOLO J-pipe Axlebacks will be exactly what you need.

Did you visit the link I provided for the axlebacks?

I'd suggest you call up steve (GOINGSOLO2) and he can answer any additional questions you may have.

--zepcom


2009.1 ZEPCOM MGM G8 GT
Kooks LT's, SOLO HFC & Mach Unbalanced with J-pipes, SLP Tips.
Livernois tune, VCM, FE3's, full Holden blue gauges conversion, iphone on display. Daily Driver FTW
The ZEPCOM G8 was SOLO's test mule
www.youtube.com/zepcom

Bought 3/30/2009, retired 7/18/2017 at 136k miles, still strong. Been a great ride, she will be missed!
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post #8 of 8 (permalink) Old 09-28-2011, 01:45 PM Thread Starter
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Great Zepcom.... thanks.

White-hot G8 GXP...stock stall, NicD tune, Kooks mids, TVS2300
--------------------------------------
New crate motor Feb 2016
Mar 2017: 12.0 @ 119.5 at Tucson Dragway
Jun 2017: Comp Cam, OEM cats removed
Nov 2017: 11.9 @ 122 at Tucson Dragway, DA = 4600
Jan 2018: Re-tuned for cat removal. Pulley down to 2.8
Jan 2018: 11.7 @ 122.5 at WHP, DA = 1500 bad traction
Dec 2018: 11.7 @ 121 at Tucson Dragway, DA 4000
jbak is offline  
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